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Thu, 5 Dec 2024 01:05:04 +0000 Date: Thu, 5 Dec 2024 00:54:55 +0000 (UTC) From: Jbum List To: Roman Mamedov Cc: "linux-raid@vger.kernel.org" Message-ID: <1704682970.3404601.1733360095994@mail.yahoo.com> In-Reply-To: <20241205052615.449ce9f3@nvm> References: <1552948949.3399643.1733357342509.ref@mail.yahoo.com> <1552948949.3399643.1733357342509@mail.yahoo.com> <20241205052615.449ce9f3@nvm> Subject: Re: Resuming mdadm reshape on a different system Precedence: bulk X-Mailing-List: linux-raid@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Mailer: WebService/1.1.22941 YMailNovation > On Wednesday, December 4, 2024 at 04:26:22 PM PST, Roman Mamedov wrote: > > On Thu, 5 Dec 2024 00:09:02 +0000 (UTC) > > Jbum List wrote: > >> My current situation: >> >> 1. Raspberry Pi 4 w/ 4 disk RAID 5 array >> 2. PC for general development and test. >> >> I had a 5th disk I wanted to add to the array and in the interest of mak= ing things go faster, I decided to temporarily hook up the raid array to my= PC.=C2=A0 I brought over the existing mdadm.conf settings from the Pi and = the array was brought up successfully without any issue on my PC. >> >> I started the grow/reshape operation after adding the new disk and every= thing is going well.=C2=A0 However, I noticed that the rebuild speed isn't = that much better than what I'm used to see on the Pi.=C2=A0 So rather than = wait for the operation to complete (in a few days), I wanted to move the ar= ray over to the Pi and continue there. >> >> Can I pause/halt the reshape that's currently running on my PC and resum= e on the Pi?=C2=A0 I know you can pause/halt and resume on the same system = it was started on but wasn't sure if that's possible across systems when bo= th have the same configuration settings for the raid array. > > Should be no problem. The reshape state is not saved in the OS, it's on t= he actual array drives. Awesome.=C2=A0 That's music to my ears.=C2=A0 Thanks for the confirmation. > > Before moving it back, you could first try: > >=C2=A0 echo 1000000 > /sys/devices/virtual/block/mdX/md/sync_speed_min > I tried this but I didn't see any noticeable difference.=C2=A0 It could be = due to other settings I had already tweaked (read ahead, stripe cache size,= etc.). > and see if this makes it faster. > > I would also expect the PC to be faster, at least if you connect the driv= es to > its onboard fully independent SATA ports with enough PCIe bandwidth to th= e > controller, and not e.g. the same USB enclosure. My "PC" is really a laptop so I'm using the same multi-bay drive enclosure.= =C2=A0 I suspect the USB interface is what's mostly limiting the speed.=C2= =A0 Appreciate the suggestion though. Thanks, Roman.